kolzer



(No Model.) 2 Sheets-Sheet 1. J. KOLZER.

TELEGRAPH IG REPBATE'E.

Patented Mar. 9, 1886.

II 17mm? m nu N. PHERS, Phuio-Lllhagnphur, wnhlnghn. D.C.

I UNITED STATES PATENT @EETQE.

JOSEPH KOLZER, OF DUISBURG-ON-THE-RHINE, PRUSSIA, GERMANY.

TELEGRAPHIC' REPEATER.

SPECIFICATION forming part of Letters Patent No,337,590, dated March 9, 1886.

Application filed Augnst14,1884. Serial No. 140,598. (No model.)

To all whom it may concern.-

Be it known that I, JosEPH KoLzER, a subject of the King of Prussia, residing at Duis-' burg, in the Kingdom of Prussia, and German Empire, have invented new and useful Improvements in Telegraphic Apparatus, of which the following is a specification.

This invention relates to telegraphic apparatus whereby messages can be transmitted from a remote station in the main line to a remote station in a branch line, and from a remote station in a branch line to a remote station in the main line.

This invention consists in polarized relays of-a special construction and arrangement of circuit-closing keys, commutators, registers, and main and branch line electrical circuits,

- whereby messages can be transmitted in the manner above briefly described, all of which is more fully pointed out in the following specification and claims and illustrated in the accompanying drawings, in which-- Figure 1 is a view of the apparatus. Fig. 2 is a sectional view of detail parts of one of the relays. Fig. 3 is a view of a modification.

In the drawings, Fig. 1, the letters Rp, and R p indicate two polarized relays. S S are the registers; U, U and U'', the commutators; T T, the finger-keys; G G, the galvanometers; B, the local battery connected with the branch line N; and B is the battery connected with the main line 0 W.

Referring to Fig. 1, the armature-lever of the polarized relay R which latter is introduced in the branch-line circuit, is provided on its right-hand contact-surface with a small projecting contact, 1, and around the righthand contact-screw L extends a metallic piece, 3 which is secured to said screw L and projects outward therefrom. One extension of the piece 3 is bent so as to form a hook, from which extends a contact, k, which may be formed by a small screw. This hook limits the vibration of a steel contact-arm, z, and also conducts the electric current arriving from O and through the spring 5 to the binding-post a. The other extension, 0, of the piece 3/ is secured to but insulated from an upright plate, Z, which is bent at a right angle. This plate Z has a tapped hole formed therein for the reception of abinding-screw, which is in electrical connection with the. bindingscrews h.

l and c, which are insulated from the relay R 1). The connection from binding-screw c to screw Z terminates in a spiral spring or coil, 9, in order that the same will not interfere with the motion of the armature. The springarm iis secured in metallic contact to the plate Z by means of two screws, and ordinarily the free end of this spring-arm is in contact with contact is of the metallic piece y. The contact-screw L is provided with an insulated point, j, and serves as a support for the spring 1', and also to regulate the extent of its vibrations. The armature of the polarized relay R f, which is introduced in the circuit of the main line, is provided with a contactstrip, at, which is separated therefrom by an insulating-layer, 0. This contactstrip receives the current passing to the branch line, which is conducted through contact-screw d when the armature is moved away from contact screw d, and to lead said current directly to spring 9 and binding-posts h and c, and from thence to the branch circuit, so that the current does not pass through relay Rp. The binding-post h is'secured to the relay, but insulated therefrom, and to it is secured one end of the wire coil 9, which is attached at its other end to a contact-strip by a screw, S, and the screw h is in conducting connection with insulated bindingscrew c. The fingerkey T has a broken contact-plate, r r, as shown. The shorter portion 1' is connected with the contact-screw d of relay R 12 and the portion 1* thereof forms the contact for the finger-key. The back plate of the commutator U is broken and can be connected by a plug.

For transmitting a message from a remote station in the main line 0 \V to a station in the branch line N, or vice versa, the holes 1 in the commutators U U U and the finger-key plate are plugged. The course of the current in the main-line circuit is now asfollows: From the direction of point() in the main line to galvanometer Gr through registers or writing-instrument S battery B", to commutator U, through. helices of relay R 12 relay R 1), through binding post 0, binding-screw h, spring 9, plate Z, spring-arm t, contact 70, metallic plate 3 to binding-post a, and from thence to commutator U, over plugged hole therein to finger-key, T to W, &c., whereby the armature'levers of the writing apparatus or register S and the relay R12 are attracted and are in contact with contact d.

The course of the current in the branch-line circuit is as follows: From wire N to galvanometer G, to finger-key T, from thence to commutator U, over plugged hole 1 therein, to relay Rp, then to commutator U", through center plate thereof, to armature-lever a n of relay It 1), through contact screw d, and thence to the commutator U, through plate thereof, and to the ground.

If, now, the current in the main circuit 0 W is interrupted by depressing a finger-key in the main-line circuit, the writing apparatus S and the relay R1) become inoperative and the armature-lever n a of the relay R 1) moves against the contact-screw (Z, thus breaking the connection of the contact-screw d with the earth and causing a contact between the metallic strip on and contact-screw d. This closes the circuit from battery B, which circuit now passes as follows, (since the battery has one pole groundedz) From battery 13' to finger-key T, over plugged hole r in the contact-plate thereof, relay R1), through contact-screw d, contact-plate m, spring g, binding-post c, to

commutator U over plugged hole 1 thereof,

to fingerkey T, (through contact-plate and the body of the key,) to galvanometer G, and from thence to the branch circuit N and actuates the register or writing-instrument at the distant station. The just-described current cannot pass from the commutator U over relay It 1) and commutator U armature an, and contact-screw d to the earth because the armature a it bears against the contact-screw d as long as a current passes through circuit N, and consequently the connection with the earth of contact-screw dis broken. The armature-lever G G of the relay It 1) therefore remains against the contact screw Z and the circuit 0 remains closed at K.

If, now, the remote station of the branch circuit N sends a current which finds its way to the earth through the armature lever n n, the armaturelever of the relay R causes the local current through contactscrew Z and spring-arm i of the battery B to the relay R p". The spring t of armature O 0 yields to the pressure and moves away from contact is, whereby the main-line circuit 0 \V will be broken. The armature of relay R 12 remains against the contact'screw d, so that no disturbing current can enter the branch circuit N, and the connection of the contact-screw d with the earth is also maintained, because the local current Z i is closed before the main-line current 0 W is broken. When the current from the remote station of the branch circuit N ceases, the armature O 0 falls back to contact Z, the spring-arm '5 remaining so long against contact Z until it is engaged by the projection 70, thus closing the main-line circuit 0 W, and then said spring-arm i clears contact Z', thereby breaking the local current Z z.

A current continuously circulates through the helices of relay R 19 during the time that the circuit N is operating, because the closing of the local current always precedes the breaking of the line current, and the closing of the line-current precedes the breaking of the local current; consequently the armature n n is always attracted and remains against contactscrew (Z, which causes the connection with the ground to be maintained and also prevents the entrance of a disturbing current into the branch-line current N. The branch circuitN is separated from the mainline circuit 0 \V when the plugs in the commutators U" and U are removed from holes 1 and inserted in holes 2 thereof. If a remote station on the branch line calls, the system of transmission transfers the signals to the main line.

The branch-line circuit N is placed in connection with the writing-instrument S, and the two relays are cut out if the plug in the commutator U and key T are removed from holes 1 and inserted into holes 2. The circuit in this case is then independent. The relays may be replaced by writing'instruments having a similar construction to said relays, so that they will serve both to write and to transmit the currents.

In Fig. 2 a modification is shown in-which a polarized relay, R1), replaces R p, the construction of which polarized relay R1) is precisely identical to the relay described in application No. 140,597. The relay R fis replaced by a Morse relay, R m, which latter is introduced in the main-line circuit, and is provided with an insulated metal contact-plate, m, on its armature-lever in a similar manner to the relay R 19, before described, and it has also the lateral connection through c h g',with the addition of an insulated post, h, similar to the connection 0 hg of relay R19 The remaining apparatus and the connections are the same as shown in Fig.1. The courses of the currents and the mode of operation are also precisely similar thereto.

The combination of a polarized relay with a Morse relay is particularly suitable for the lateral connection of a branch current of considerable length, into which the polarized relay is introduced, and with a main-1ine circuit of moderate length, into which the Morse relay is introduced, and which is in this case sui'licient for all requirements. On the other hand, the first cost of construction and the subsequent running expenses are less than when a polarized relay is used.

What I claim as new, and desire to secure by Letters'Patent, is-

1. The combination, with the helices and armature-lever of a relay and the contactscrews Z L, of the spring-arm i, separate from the armature-lever, the contact Z thereof, the metallic piece y, the hook-shaped extension thereof, contact k in said extension, bindingpost a, binding-screw h, plate Z, the yielding conductor connecting plate Z with screw h, and insulated point j of contact-screw L, substantially as shown and described.

2. In a telegraph apparatus, the combination, with the relays R p and R1), constructed as shown and described, of the line-connections for main and branch circuits, suitable batteries for the latter, finger-keys T T, and the eommutators U U' U whereby a message can be transmitted from a remote station in a branch line to a station on the main line, or vice versa, in a manner substantially as set forth, all substantially as shown and described.

3. In a telegraph apparatus, the combination,with the polarized relay Rp, constructed as shown and described, of a Morse relay, R m, having its armature-lever provided with an extension, a contact-plate, m, mounted on the extension and insulated from the armaturelever, a yielding electrical conductor, 9, connected with the contact-plate, and a bindingpost on the base of the relay, and line-connections for main and branch circuits, suitable batteries for the latter, finger-keys, and commutators, all arranged substantially as set forth.

In testimony whereofl have signed my name tothis specification in the presence of two subscribing witnesses.

JOSEPH KoLzER.

Witnesses:

SAMUEL SPAOKMAN, PH. PRITMAN. 

